diff --git a/pre-contest/a_billeterie/solutions/a_billeterie.exs b/pre-contest/a_billeterie/solutions/a_billeterie.exs
new file mode 100644
index 0000000..c8374b0
--- /dev/null
+++ b/pre-contest/a_billeterie/solutions/a_billeterie.exs
@@ -0,0 +1,10 @@
+readInt = fn -> IO.read(:stdio, :line) |> String.trim() |> String.to_integer() end
+
+prix2nde = readInt.()
+prix1ere = readInt.()
+
+nbBillets2nde = readInt.()
+nbBillets1ere = readInt.()
+
+prixTotal = prix2nde * nbBillets2nde + prix1ere * nbBillets1ere
+IO.puts(prixTotal)
diff --git a/pre-contest/b_jeu_des_batonnets/solutions/b_jeu_des_batonnets.exs b/pre-contest/b_jeu_des_batonnets/solutions/b_jeu_des_batonnets.exs
new file mode 100644
index 0000000..afbb301
--- /dev/null
+++ b/pre-contest/b_jeu_des_batonnets/solutions/b_jeu_des_batonnets.exs
@@ -0,0 +1,16 @@
+[nb, b] =
+  IO.read(:stdio, :line)
+  |> String.split(" ")
+  |> Enum.map(&String.trim/1)
+  |> Enum.map(&String.to_integer/1)
+
+j = IO.read(:stdio, :line) |> String.trim()
+
+d = &Integer.floor_div/2
+
+if (j == "0" && (d.(nb - b, b + 1) - d.(nb - 1, b + 1) < 0 || rem(nb - b, b + 1) == 0)) ||
+     (j == "1" && (d.(nb - b, b + 1) - d.(nb - 1, b + 1) == 0 && rem(nb - b, b + 1) != 0)) do
+  IO.puts("OUI")
+else
+  IO.puts("NON")
+end